A method for obtaining the primary scattering contribution term of vegetation bidirectional reflection
A two-way, reflected radiation technology, applied in the field of remote sensing image recognition, can solve the problems of increased calculation amount and large amount of calculation, and achieve the effect of reducing calculation complexity and improving calculation accuracy
Active Publication Date: 2018-02-02
PEKING UNIV
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Problems solved by technology
The real scene simulation method can generate hot spots, but the amount of calculation is too large. With the increase of vegetation elements, the amount of calculation increases geometrically
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[0133] The present invention is further described by way of exemplary embodiments below.
[0134] Taking the discrete vegetation black fir forest as an example, Table 2 was obtained through field measurement, where H 1 represents the canopy height of the black fir forest, H 2 Represents the basal height of the black cedar forest, LAI a stands for true leaf area index, LAI e Represents the effective leaf area index. , ρ v，red Represents the reflectance of leaves in the infrared band, ρ g，red Represents the surface reflectance of infrared band illumination, ρ v，nir Represents the reflectance of leaves in the near-infrared band, ρ g，nir Represents the surface reflectance of near-infrared band illumination,
[0135] Table 2
[0136]
[0137] The relationship between porosity P and zenith angle obtained through actual measurement is shown in Table 3, where the aggregation index ξ is calculated by formula (1),
[0138] table 3
[0139]
[0140] When the sun's inciden...
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The invention discloses an acquisition method of a vegetation bidirectional reflection primary scattering contribution item. The method comprises the following steps of through a vegetation physiological parameter and an aggregation index, acquiring a porosity; using the porosity in the step1 to define and calculate a vegetation four component area proportion based on a vegetation element; calculating a proportion of direct solar radiation and a sky scattered light intensity; and through a correlation parameter of a leaf and soil, the porosity, the vegetation four component area proportion and the proportion of direct solar radiation and the sky scattered light intensity which are acquired through the above steps, acquiring the vegetation bidirectional reflection primary scattering contribution item. Accuracy of the method is high, calculation is simple and the method is suitable for various kinds of vegetation types. A plant-canopy non-isotropic reason boils down to three aspects of a geometrical relationship of the sun, a target and a sensor, multi-dimensioned aggregation and the proportion of the direct solar radiation and the sky scattered light intensity.
Description
technical field [0001] The invention relates to the technical field of remote sensing image recognition, in particular to a method for acquiring vegetation bidirectional reflection primary scattering contribution items. Background technique [0002] Remote sensing images are "photographs" of the earth's surface, which truly show the shape, size, color and other information of objects on the earth's surface. To retrieve the structure and physiological parameters of surface plants from remote sensing images, it is necessary to accurately describe the relationship between plants, the sun and sensors. [0003] The reflection of vegetation to the sun's short-wave radiation (with a wavelength of 0.3 μm-2.5 μm) belongs to the vegetation dichroic reflection. In the prior art, the bidirectional reflectance distribution function is usually used to describe the bidirectional reflection behavior, which is defined as: [0004] [0005] Among them, L is the reflected radiation bright...
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IPC IPC(8): G01J1/00
CPCG01J1/00
Inventor 徐希孺范闻捷李举材赵鹏
Owner PEKING UNIV